Rotary engine



(No Model.)

J. FORSYTHE.

ROT'ARY ENGINE.

Patentd Feb. 2, 1886.

INVENTEJR WITNE 5555 i 6%? MM Unirea STATES Parent: Urrrca JOSEPH FORSYTHE, OF PITTSBURG, PENNSYLVANIA.

ROTARY ENGlNE.,

SPECIFICATION fcrming part of Letters Patent No. 335,].20, dated February 2, 1886.

Application filed June lil, 1885.

TO all whom it may con/067%:

Be it known that I, JOSEPH Fonsv'rnn, a citizen of the United States, residing in the city of Pittsburg, county of Allegheny, and State of Pennsylvania, have invented certain new and useful Inproveinents in Rotary Engines, the following being a description thereof, reference being had to the acconpanying drawings, which form part of this specification.

This invention relates to rotary engines, specally adapted to the development, application, or utilization of steaIn-power; and it consists in the peculiar eonfornation, combi nation, and operation of the cylinder, pisten, and valves, and their parts, respectivcly.

Figure l represents a vertical section of engine. Fig. 2 represents a Vertical section of cylinder transverse to Fig. l, showing the head in place between the ilanges of the piston. Fig. 3 represents a horizontal section of engine.

The nature of iny invention will be readily understood from the following description, taken in connection with the accompanying` drawings.

This engine, not to speak of bed-plate,journals, 820., consists of a hollow cylinder, G, in one piece with one of its beses, the other base-'. e., the cap being nade separate and bolted on, both bases perforated at Centers for shaft of pisten, and having proper stnffingboXes at perforations around shaft to prevent leakage. This cylinder has afixed to or set in its concave surface, at opposite sides, two heads, H, sufficiently separated froni its bases to pernit theintervention of the i'langes of the pistou. These heads are pierced to vent 'i from their coneave surfaees into grooves or Slots in the convex body of the pisten, and are sniliciently long to prevent the steain escaping backward into the valve-eircle. Each head has on one side an influent way, t', into the valve circle o c, and on the other side an effluent or exhaust way, c, froni the Valvecircle.

The piston P is spool-shaped, the spool being hollowed at ends for 'eduction of frictionsurface, and pierced with holes froni end to end for equalization of pressurc on ends.

Serial No. 169370. (No model.)

The flangesf (shown in Fig. 2) of this piston intervene between the heads and the bases of the cylinder, reaehing the concave surface of the cylinder. These ilanges are cut across radially arallel to the axis of the` spool or piston, to make slides for the valves, down to the convex surface of the body of the piston, and thence the cut reaching from end to end, extends into the body of the piston toward its axis, to form recesses for the valves. Each recess has, when desired to give greater drivingsurface to the valve, a barrel bored in for the insertion of a pisten behind the valve, the barrel being` closed from the valve-circle by caps bolted on, so fitting that the valve slides free] y between. Each of these recesses has also on the side of the valve last passing the heads and in the conVeX surface of the body of the pisten, a groove or slot, s, formed to catch the stean venting fron the concave surface of the head, and thence a valve way to conduct it to the valve-retreat and barrel back of the valve.

As to its mode of operation, this engine works as follows: The steam or other power inediun is introduced by the influent Way through the fixed head into any slot in opposition, passes thence by the Valveway to the Valve-barrel and recess back of the valve, and forces out the Valve, whichin its outward mo tion is regulatcd by the line defined by the fixed head to prevent shock, into the valvecircle in front of and in opposition to the fixed head, where it acts as a piston or' moving head, and the stean, EC., being thus confined between the valve or noving` head of a'otary pistou and the fixed head of a stationary cylinder, the piston is forced into revolution, the revolution bringing another valve into operation in like nanner, as described, and each valve as it approaches the other fixed head is first eased of its pressure by the steam, &c., escaping out at the eiiiuent or exhaust way, and then by the revolution of the piston borne against the longer incline of the other head, and by its resistance to its further passage pressed back into its 'ecess.

I claim as my invention In a rotary steaneugine, a stationary cyl inder having one or more fixed heads, each IOC head having inelines and influent and efiuent mit steam exhausting back from valve-reeess, ways, in eombnation with a rotabing pisten substantially as described and shown. provided with three or more concentric seg- In witness whereof I hereto sign my name. IO mental Slots in its convex surface, so arranged J OSEPH FORSYTHE.

5 as to admit steam first to valve-recesses to witnesses:

drive out; valves, and then into valve-cirele W. P. POTTER, between fixed head and valves; also, to trans- H. L. CASTLE. 

